Nageki no Kenkou Yuuryouji

Description:

Hiroe Ogawa is a healthy, normal girl with an extraordinary, private dilemma. Hiroe is unable to reach sexual climax under any circumstances. Over Hiroe's objections, older housemate Mayaka and landlady Yayoi use a varity of sexual techniques, appendages, and even hypnotism in order to help Hiroe achieve her elusive goal.
(Source: ANN)